Re: [PATCH v8 0/5] Initial support for multi-actuator HDDs

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On 2021/10/27 9:45, Jens Axboe wrote:
> On 9/8/21 8:35 PM, Damien Le Moal wrote:
>> Single LUN multi-actuator hard-disks are cappable to seek and execute
>> multiple commands in parallel. This capability is exposed to the host
>> using the Concurrent Positioning Ranges VPD page (SCSI) and Log (ATA).
>> Each positioning range describes the contiguous set of LBAs that an
>> actuator serves.
>>
>> This series adds support to the scsi disk driver to retreive this
>> information and advertize it to user space through sysfs. libata is
>> also modified to handle ATA drives.
>>
>> The first patch adds the block layer plumbing to expose concurrent
>> sector ranges of the device through sysfs as a sub-directory of the
>> device sysfs queue directory. Patch 2 and 3 add support to sd and
>> libata. Finally patch 4 documents the sysfs queue attributed changes.
>> Patch 5 fixes a typo in the document file (strictly speaking, not
>> related to this series).
>>
>> This series does not attempt in any way to optimize accesses to
>> multi-actuator devices (e.g. block IO schedulers or filesystems). This
>> initial support only exposes the independent access ranges information
>> to user space through sysfs.
> 
> Let's get this queued up for 5.16. I forgot what we agreed upon, can go
> either block or SCSI. We likely have a bunch more block changes this
> round than usual, and hence a higher risk of conflict, so from that
> perspective alone I think the block layer would be easier.
> 
> In any case, Damien, it needs a respin as it doesn't apply against
> my for-5.16/block at this point.

OK. Thanks. Sending a rebased version very soon (today most likely).



-- 
Damien Le Moal
Western Digital Research




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